Instructions

1. Cut the broccoli into florets: Cut the florets away from the stem, then cut the florets into smaller, bite-sized pieces. The stem can be cut into small 1/2-inch-thick pieces.
2. Steam the broccoli: Steam the broccoli in either the microwave or on the stovetop until the tops are bright green and the stems are cooked, but still slightly crunchy. Spread out in a single layer on a plate to air-dry until ready to stir-fry. See: How To Cook Broccoli: 5 Ways
3. Slice the beef: Trim away any large pieces of fat. Cut the steak down its length, withthe grain, into strips 2 to 3 inches wide. Then cut each thin strip across the grain into bite-sized pieces roughly 1/4-inch wide.
4. Coat the beef with the marinade: Transfer the beef to a mixing bowl. Measure out the cornstarch, soy sauce, rice wine, and salt over top. Toss to coat the beef with the marinade ingredients. Drizzle the sesame oil over top, and toss again to coat. The marinade will absorb into the beef and the beef will look quite dry — this is normal. Set the bowl of sliced beef and a clean plate to hold the cooked beef within reach near the stove.
5. Make the stir-fry sauce: Whisk together the broth, oyster sauce, and soy sauce in a small bowl. Set within reach of the stove.
6. Heat the wok: Set your wok over high heat until a drop of water evaporates within a second or two of contact.
7. Add 1 tablespoon of oil: Pour 1 tablespoon of oil down the side of the pan. Swirl to coat the bottom and lower sides of the wok evenly.
8. Stir-fry the garlic: Stir-fry the garlic just until fragrant, 10 to 20 seconds. If you're using fermented black beans, add them to the pan along with the garlic and use your spatula to smash them together. Push the garlic (and beans) up the sides of the wok to make space in the middle.
9. Cook the beef for 1 minute: Transfer the beef to the hot wok and spread it into layer on the bottom and lower-sides of the wok. Use your spatula to break apart any clumps and move them to unused spaces on the wok. Cook for 1 minute without moving to sear the bottom.
10. Stir-fry the beef about 60 seconds: Quickly stir-fry the beef with the garlic, using your thin spatula to get under the seared pieces and moving everything around the pan. Continue until all the sides are beginning to brown and the beef is almost cooked through, but you see just a little pink in the middle, about 60 seconds. Transfer the beef to the clean plate by the stove.
11. Stir-fry the broccoli: Swirl another tablespoon of oil into the pan. Add all of the broccoli. Stir-fry another 60 seconds, until the broccoli is warmed through, but is still bright green and crisp-tender. If it looks like it's starting to wilt or lose its green color, proceed immediately to the next step.
12. Return the beef to the wok with the sauce: Add the beef and any juices back to the wok with the broccoli. Pour the sauce down the side of the wok.
13. Stir-fry for another 30 to 60 seconds: Stir-fry until the beef and broccoli are coated with sauce and the beef is cooked as well-done as you prefer. Add extra oyster sauce to make a thicker coating, if desired.
14. Serve immediately: Transfer the beef and broccoli to a serving dish. Serve while hot, with cooked rice.